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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d232ae95402b670b22b2714afd3bd44aa5d9edc04b78fc24cdc92a6f17eeef0' 
  AND token = 'lyM/yZDLwmYbc8qLXC6wTKL1VGAYFw0bFidvXmtXoCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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