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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71635a4a3eb719b9088ff47b4b90867c1537d8bafcb39861b451697c1ebd0f61' 
  AND token = 'dHiL/QEYTayf/T5brVyjft9WTUh+WFNWS0iXGuNphrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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