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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b34f11afdc0f39e2f2df8209ba9f2733bc8b86229df458bbd85eb862d927bd68' 
  AND token = 'p05SeG57stzpx1YwfqxhMiReQ8rJ2DkKVipfME5LlZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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