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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2553b0ef5c505cb4d15b88b56c5b7a1ac9cdecb46cb6a90d5c0006c851f83ae4' 
  AND token = 'uWPgbXbY2UETPf/jzyw4hLx7JDC3PlC1o0X2rVuoy5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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