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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6a5b9e049d6f9cdb5b1b76008812b6fc25a236b530415ccf5695953533d0d58' 
  AND token = 'DYqKy0hqykPQ6ipbUEjC9RNjnai8Z7GR+6TxtjVtIhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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