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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bca568a63160392d5ef29da00b6032ddb3873ebd7429af71fe7858ec85f8e7a' 
  AND token = 'jFvNvqveNrllv5nZAPTkTixdelwjrYw1OHMQ/iaThu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}