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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36e7f9d2695eacfe301a69ea6a6827e6a1429fa365fe871cc543ed93a14db564' 
  AND token = '35UtrYpe38iyDJRy/sbHs+Xh76RchKZrUbA0h0Vpks4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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