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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a477078909ff7c46c42eb792cea3e0b665097cf4dd1ea685124038b1b8078cd' 
  AND token = '7ldlJ1wujABvMVd7bNHBpOwjbAV0f/PqKAfIRJd8wyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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