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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd3a7facf52077bfbfa0e2b49e40c3c08d3f2736f8ca58531b43ac01f86b0c23' 
  AND token = '1jUD2dko55cZsFS0yCChwm36kQBaWRv2wqYT584WbbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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