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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a00a15a626fd4d53e51cd14e6816e3e90a32704008c31d81932d1513e1bd0597' 
  AND token = 'FufqXOyXtw4n6YED9NOeDFto2foQKLRjrfnuTd9+6YA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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