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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '018f2010a1767b3b54ab27dbc081a357b7f5ff18dde8b7335a876a1e9975ab86' 
  AND token = 'hZMZF4LcAzFQ6UmvNS2lb4C1qV1MdHseUGn8toSGY2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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