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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adfc48c26cb161dc8d6abe41f4011da217f6e467cb886986ff0a578604e26171' 
  AND token = 'TW84s6QsId0duhkDIocZG1FVjW44Lhs/XPshwwX92a8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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