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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db71f05524a3a18519e04798be75aad3da668cdcdbce1deccb47d131bcb16367' 
  AND token = '6+fqoxk9+TOrJo3+dhsYYhzEeDd5kfw+0fs3DbgUWs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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