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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cf98dc342e2055260c157f4a1213a6a34013901a8907dfc9dec56b62fe7ef9b' 
  AND token = 'kkO0WkAyUcxCuQPs7OBVOVPeU6mhoQurVvCbySbCGmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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