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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3eed5cde783d544f8bcf1de3d7b2d98ecafda06080ac42e0e3ca51e0102ee6d' 
  AND token = '8IejnH74J1RxlsQ+GX8nsfQ5FcGuJTa4UIObkcX7+ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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