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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd534076c075e7c4c5a14cae5c3c9334aed8c257c4eb6245a9512a3cacfc25cf8' 
  AND token = 'GfISC6q8hTJoB1bdI2wW77Izj5xuZoKBKj0d8h3tdvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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