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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f98792dcb280dc76d25d99000e50d0fc351cf25edd6fb634d10af1928385837' 
  AND token = 'MKtFo5zEbK/AzOyNLJne4i8y0VRPRs/YFd4YQ3TYw1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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