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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b08ae5004bc784a6a4a8238b8d0ba79211dae5ff8cb60c1e6f1a13fdc3d1a58e' 
  AND token = 'ZBCXW71BLYr0ngtuhbT0fvkPMcztaBkhV/n480u+yn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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