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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c8d04b56addaba846df260501a1bd078bbbfeb5547aa643dec278e84bd40ee0' 
  AND token = '9CRPUxQYJL9NSV4D9r8g6YLf7KrghVTGQQ8sdPooCos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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