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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e702c906ebb7c8a187c3d9dcb0d04a207226e8473d6f5578b3ddf9e42039a8a2' 
  AND token = 'YnvndQEWG6EstuYwboucrIXIO9/3ABx3kTp/23vx+VE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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