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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24c9a06e5ba2ba70e21591e47a967670a2792905f3ecedb7aa4f9098e179fc3a' 
  AND token = 'Hgr/Xd0r2CycRchuas6Osk4uQ0KXN0UAhKmKQqKguis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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