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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1877115b36d5f37784cd77dc8240218eea96d0bd405242a611de63b8765a8744' 
  AND token = '/6NhEOU6N6qo1ZiowO481bOck7iJcnM5d+laJfLPO8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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