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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3624f48239979e60b095a31685c3095699a8d602d91c34ca3277884a50db5ec2' 
  AND token = '5e2NHz/ZOCn0RO6j9lwzCwdUajZPa69n4OqmLld6UTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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