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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79f4addc294a0eb66985ff31ac87c1b305849db081da6ce409b174013193b42a' 
  AND token = '9iSKJHpAuWzrUB7oWccsiIx78iV9v1fR6H6d9IYgBLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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