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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '606c96f019a75401ae34f512f06d1d85b70f16cf962f19dcb2706160b36eb341' 
  AND token = 'BOLIwzlyDCqxq9fyjL5ch1qbjdkrqOvp7a0U0GN4OQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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