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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd16b8e831871ad9bcdbbcdf4a2a980bafb9b56e685d6139c3d0119b74d100756' 
  AND token = '75ACUun7IIyEEveA3wMvnq+o87/LLkNOs44+/k/e7+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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