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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b94532acf97653d2a5aa3e5b308c34c76fe734356e66f7ea9fd3387b2a118401' 
  AND token = 'FrlFZrQbs8eKiQhC9prue6Uhb5rbApyeEfqf9izVdqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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