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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9f48e473cf0772a1324920d37600438e58e8c7ef0a08d5826c0eaeb5a0a17f1' 
  AND token = 'hUhxhjMscy1IEwG7NA8/ctZf7Qj8wphxmqDE69OUCl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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