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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec1221dbdd9d8c4cd439dcb3a3cb7fdecb13b798223d26d973cb9a620bd358c1' 
  AND token = 'YUYNgvN7FDC8HK6r5YUGMTdNSkSYYptLDiBjmw2Nc38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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