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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '979fbb077b4a668932414f374d93165c08018880d88100e60800dc756c1fc69d' 
  AND token = '0trQ4ydrh7eXECmqIAENO5WeslOo1YQlX8Qr0EcVfJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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