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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd70f677f015555541bad3ae780bce5094248e2ca5fe17e98ea471100cc4e22a3' 
  AND token = '/M+A8T+CmsGx1PfIA1g6zougIc2n5uAJy2hJhxM3Y4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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