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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92f24b8adcb751ed03bceac959407f50026fa6201681de5144253ec501bf8a92' 
  AND token = 'CwFs8nFQfYOGrvjtXFPctywXYkClW5LZQyVWOSQWW+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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