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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddb8f5de176f39f6cbcdf9f1de6c2ec5c4b3e705ef2e64253a4a9056e94ca837' 
  AND token = 'g7UmgAFnTxF9exVTIgtyOLgi/mpl7hEXCZS3Lsmm/ZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00144

JSON explain

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