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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2659cea9efd51da63b19e6ae0b17aa6dddd0dae7af084ff85acf4081dddd859a' 
  AND token = '2yJUWymFw0s3vR+vbzZJUtbKX8TQadJHEwC2C5BwEkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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