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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f962b9479423cda0d0645af1bf4b33522fb9b02cd96b25141f9ebf1d3d22cccc' 
  AND token = 'Y6cE10XAwa374UdYWo7Mos0zUdm4KGVX6ttIax6Pa9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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