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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34b2d16d89ca255b584ea7144580d910c466dd896e55681d9622e1a75f48c6a2' 
  AND token = 'U+K5Zpk/K8O2pNlWguXeaH9OkU+PE7NdSWZpy5iDpQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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