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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5614ed9c9fb6f8d54b9e035bff168f58c8bd11611f6314330398a931b18cd1bf' 
  AND token = 'GIaoYHNRDb79G11VKrrcy3UU1kjzTGMTUwl4zgTEplA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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