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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '991c5737c25fdb2f4a492002a9d059ad1e5e4d7a743bfad73d86162175ac4b96' 
  AND token = 'tJlJFGq8bu/RVpHw9MklFU/TulRweottulPvHxFfJ0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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