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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57d15449a29bda4b348b73f3ab60be2360517a864135a4afbc7676600bb84a29' 
  AND token = 'lfoD9s0DlV+3aEjXzJJ+IBTrGOF5EIlWoGuonxXHUNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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