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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9af5d9d38392624e8c1f0ab72b5d33065f3a787e0393f743e60aac1fd2bce7f4' 
  AND token = 'NgdMOMjFso3ThPy1jSnNqgy+bisKDZkpi5xuXiC5j+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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