SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac533be404b34cf663300ada8eddaec040b383884105c942627c739f46315bd0' 
  AND token = 'YJzzzGyjVFjq6Cx54rIIzWBk2KdQBTYjKdSmqF3yyXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00117

JSON explain

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