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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '702eb103d08d3d7de643671d7bac8e167b8e973734a6658d58f66891fb23c07d' 
  AND token = 'a6Ydw4Iuc1I6p6I2/HywolvSaTKkTBWd9F58TFtLMP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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