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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f929b7128317fac3461324e65ccb98a80512b457c1c2600c4f1a71ab366a06f6' 
  AND token = '/2kiqMbN1CoydvsvCZaN/WImiIFU/30zfEK/yHNXn7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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