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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38d6adf01d5370bd8f23cae7ab764f21f3c83089b702cc8555379776631d6698' 
  AND token = 'ECeYKLDvexUAimh8MYe91tT7vvSmgFs/zx+WmRU2McU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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