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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4774e8d811856e89b682122a909d78e12fb490d1c86f02d7cd514ca17464ddc0' 
  AND token = 'QAKWbCD86uT9KO6ztDZs32uC+O8Gp/watMSvSBFWEBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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