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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3da9211c71fae058cab93106e6fd7e628701955635675731c161b534b0cf6461' 
  AND token = '52hp/MVLXKNULPUNfGUs/hYn1tuw1pZpVNDJ0KD71Rw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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