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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71813208c51df2714b0d4d123292d5b0c19de523cfefa306b392670a9de8f0b6' 
  AND token = 'AQE2MneJZrvivndhM8k86HUdM05kOTSii5WsDunYaQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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