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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '109f0b745866ba4af40ec11eef4e98d45397a031def6f921de1db19189cff080' 
  AND token = 'RVJY0uonoxLoXf/UIHVh/ptcf+qW2wNoTT+USA5++vA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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