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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd72c56f332070ef12e1c3dc092f9969db0260684699d31407543e855986e80ff' 
  AND token = 'C/nyTH8F0XFQSHM6WgZ3sI4RjzJVNgjL0cotW0qjQsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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