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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50206b5d471e5b14aa8800be409de7040f20ca1508b00382d0df44d869e28bb6' 
  AND token = 'dKavK3xVmi3qzXjuWuTDzhTRZQ0cC2WghjrhDC5zpLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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