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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05afaba329b69a062fecc1361e97efa99ae67a41b50cd7773712e1f06c85b393' 
  AND token = '61XjCrgLC+jRwS1Oy/APZzWCKRevN5W7zankL76PL/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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