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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '804f7140d17beeb1cce569af016899ab20ca845aa014695e79b084cdc6689cdb' 
  AND token = 'gYlgOllPmgaBNUYJ446y1G/H91FNakhSwOh7TjnzNDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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