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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0017e35138677e974f93cde45bb496aedfe1880ce800fba34c43c47abb0e9b31' 
  AND token = 'bRVMLn8vCG25FIYTcLoSkYw41hdYNn5itVZojhwtv/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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