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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da503c08a91fb7bce2120cd90bb60fea757e6e997df04ae5b256b9286b2a6ae5' 
  AND token = '1d9DzE7s8M77SCz9OqQ20I8cSsAkSP5P4Gps2B08jQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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