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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01f3c69ced5290971f4ab787ad5d39f694c989c7084d96729f475937aa3677af' 
  AND token = 'ABLg4jubtYkOCN5R6o+fUNlu4mP4/KDfZ8lPR9TbiZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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