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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1040a1ab328aaabd6086890ae5d4d97151747448f35e5daccc925a0168193719' 
  AND token = 'ZtbW6ZWELSqWBXkyKDSHV55TuwqtmM7z6M4YrdDlbuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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