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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d744897d7ac080d4d74d8946e79221c8a159edc46be559e74f8aa571fab8133' 
  AND token = '9hwOZu2Vux2ovYnERaFWn87QLdCHvBdI8ZeK27r7kbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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