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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec5fc4e3a03ed53ddcb8e679a5ad87d144f25545dfcdaceb9e7b7e1238a44eb0' 
  AND token = 'pL1BbeaK6OYI/GwJyS2tubID0KdH2QJblVtwLzYXV48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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