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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '131af06adbae239b1abc0d9aa72809d3b357495daf3f1f6daaadb6d4e33f1763' 
  AND token = 'yd1Hhv6wdb6C0HlBbwCJsKFY8JLoU0ua4+7TEMZbKq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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