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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80f9c1e264a1fcd8434a8412f564f77ef425727a728ac9023008edaea48d9330' 
  AND token = 'DV35cjCB1ANnj3ihOe6X7ztfNZbRgfNR+lN/FP/4I3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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