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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3ec3ea019f6bcdd9d0c8506e1633ef9a8c23da360ff537e3a94605e14396a99' 
  AND token = 'nokYsluuQ7XXMFrBwto//UPSodLBqq9ijaT0UgmKCyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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