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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a55dac0fb31d377ffa161d3ca145a955b635a133f8faf1549473112d72ef037' 
  AND token = 'krnbu8zlWNdXEB9BBVaEqhODdVJY3INU56Gso0maK0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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