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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe665ce86ccf598554c8149b902de099168322ebadd82ff75c0bcd2d0b69456b' 
  AND token = 'hnK5Xm0C2uB3spcX1DrBIeQb/HKtRImyyN9on6OxTFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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