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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5121ab482262089a6abbb0130e180821d3095c9773befede07c437e53aa54073' 
  AND token = 'qcXyMxIbEeZKd0A0Z9//t2SsLvosyuuIFufnOeB0MQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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