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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcda95749f9b6a72e0ee0dfe75850213a80183cb05baee427f1f369fac452dc4' 
  AND token = 'Kq8/ModVIMPsPwjx2p2SmlmriAqz/0Dx42dJi5gHIvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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