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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '665cac71640f679d040b3b184f5d671f0c97cd74948921137da6950fe7e80bc1' 
  AND token = '98MwE2A8ZS05VjHYCXABi30eEFvMN1ExZ6L8cXDTxvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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