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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2561debd1ce4376b7308bae3eaf76e6dc918c9944ddb76544207a242d989f26' 
  AND token = 'bNIJHmVbScl4A8u9iQp0QPMoPn/Nt7Kov7RmQ44vt7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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