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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06e76bffd93d3699f57de94dd2a5b1d40d0592fd80154a10e68c6545078d4ad8' 
  AND token = 'Vran9DOqoUnWv5h2JqfI2NErAbFLLY+x6Krihpg8Obs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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