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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5707834c00f837676848edacc41a9e8cc9d28ca5117b4b9f769211c6fc7ab39c' 
  AND token = '/+vfqmeg20p64AWfA4EtiYmNWOCNMazn3BkP6FgsQ1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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