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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2ec01939126a88914a2c81109083f22173ab5330c5acb605f47e6cc14d09af3' 
  AND token = 'YOvgaE4Qoj8lyf5JIh4+ZZhFGsZjOOxhkwNnLkekNyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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