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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47882d0f8fd82d175739205fd9c5e1853afdb009b4680d3ac27ac6d47009adf8' 
  AND token = '/+TD2H5Z5kYu9zkOv2YPKhS1TygHB2dfA4+7EjooABM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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