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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c85efa58f13796cc8136ca91feeb2eef757b0baea5c0529177e0a3b836fab18e' 
  AND token = '6jKRdouhwhd/frKIaZMm5pDl/pRDbvxLhWWAX90yoyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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